Yes, they are still expensive. The prices on ebay are all over the place if you track them. The 168 LED screw in bulb ranges (at auction) from $22 -$45. The 900 LED panels in red go anywhere from $120 - $175 plus shipping. The one I am using for supplemental light in the phototron cost me $35 delivered. Trying to buy another one for another germing tron but I keep getting outbid.
Not too sure of the LED effect but the plants seem to develop a much more broadening of the leaves under it's influence. At least using this bulb I cut 17 watts from my power bill.
No noticeable deteremental effect has been observed. I have 5 Trainwreck feminised seedlings that are 3 weeks old under 12/12 under the light and I expect they will display sex this week. I am neither pro or con at this moment.